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<?php $str = "Foo *Bar* Baz"; var_dump(preg_replace_callback('{\*([\\\*]*[^\*]+)\*?}', function($matches) { return "<b>{$matches[1]}</b>"; }, $str));
Output for git.master, git.master_jit, rfc.property-hooks
string(18) "Foo <b>Bar</b> Baz"

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